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Role of weather and fuel in stopping fire spread in tropical savannas

Price, Owen F., Borah, Rittick and Maier, Stefan (2014). Role of weather and fuel in stopping fire spread in tropical savannas. Austral Ecology: a journal of ecology in the Southern Hemisphere,39(2):135-144.

Document type: Journal Article
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IRMA ID 82057923xPUB592
Title Role of weather and fuel in stopping fire spread in tropical savannas
Author Price, Owen F.
Borah, Rittick
Maier, Stefan
Journal Name Austral Ecology: a journal of ecology in the Southern Hemisphere
Publication Date 2014
Volume Number 39
Issue Number 2
ISSN 1442-9985   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84872903267
Start Page 135
End Page 144
Total Pages 10
Place of Publication Australia
Publisher Wiley-Blackwell Publishing Asia
HERDC Category C1 - Journal Article (DIISR)
Abstract Analysis of wildfire extinguishment can help to identify the relative contribution of weather and management to the prevention of fire spread. Here we examine the role of weather, previous fire scars and other fuel interruptions at stopping the spread of nine large (mean 90 000 ha) late dry season fires in Arnhem Land, in the tropical savannas of northern Australia. Daily spread was mapped using Moderate-resolution Imaging Spectroradiometer (MODIS) satellite imagery with a resolution of 250 m. We sampled points along the boundary of the fires and 1 km inside the boundary and compared conditions between the two sets. Using a combination of binomial regression and regression tree analysis, we found that recent burn scars (from the same year) were very effective at stopping fires. Where there was any recent burning within 500 m of a point, there was a 92% likelihood that it was a boundary. Interruptions such as roads, rivers and topography had small but significant effects. Vegetation type and vegetation greenness also had minor effects. Weather had a small effect via wind speed. This minor role of weather was reinforced by the fact that on most days the fires were both spreading and stopping at different parts of their perimeter. In these savannas, the weather in the late dry season is relatively invariant and is probably always conducive to some degree of fire spread. Here, interruptions to the fuel are critical to stopping fires. Nevertheless, for approximately half of boundary cases, the cause of stopping was not clear. This is probably due to the coarse scale of the analysis that does not reflect fine patterns of fuel arrangements.
Keywords Arnhem Land
fire management
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Created: Wed, 19 Aug 2015, 11:59:31 CST